The creature that’s expected to inherit the Earth following a nuclear holocaust might also be well suited to help prevent man’s atomic self-destruction. Researchers at Texas A&M University’s Nuclear Security Science and Policy Institute have attached radiation sensors to the backs of cockroaches. They hope public-safety officials will one day send the souped-up insects into situations that are too risky for humans. “Cockroaches really are the perfect medium for this,” says William Charlton, an associate professor of nuclear engineering at the university and a principal investigator on the project. “They can go for extraordinarily long periods of time without food....